Abstract：A series arc fault experiment platform was built with reference to the domestic existing research results and the United States UL1699 standard.Arc current and arc voltage were collected.A high order harmonic ratio analysis method for wire current was proposed.Through the variation condition analysis for a high order harmonic ratio of current data in different load circuits, the variation characteristics of a higher order harmonic ratio caused by arc fault was summed up.Research results show that: when arc fault occurred, the high order harmonic ratio of wire current appeared to rise sharply (the mean value growth was more than 15%) , and it was not stable, in a fierce fluctuation.

Keyword：electrical fire;arc fault;high order harmonic ratio;harmonic analysis;feature extraction;